oj.uz

Submission #971839

# Submission time Handle Problem Language Result Execution time Memory
971839 2024-04-29T11:26:53 Z GrindMachine Dancing Elephants (IOI11_elephants) C++17
100 / 100
 3438 ms 26508 KB 
#pragma GCC optimize("O3,unroll-loops")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*

refs:
edi

*/

const int MOD = 1e9 + 7;
const int N = 2e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;
const int B = 455;

#include "elephants.h"

int n,L;
vector<int> a;
set<pii> st;
vector<pii> blocks[N/B+5];
vector<int> block_num, cams, mx_point;

void upd_block(int b){
    if(blocks[b].empty()) return;
    auto &curr = blocks[b];
    int siz = sz(curr);
    int ptr = siz-1;
    rev(i,siz-1,0){
        while(curr[ptr].ff-curr[i].ff > L){
            ptr--;
        }

        int j = curr[i].ss;

        if(ptr+1 == siz){
            cams[j] = 1;
            mx_point[j] = curr[i].ff+L;
        }
        else{
            int k = curr[ptr+1].ss;
            cams[j] = cams[k]+1;
            mx_point[j] = mx_point[k];
        }
    }
}

void build(){
    int ind = 0;
    rep(i,n/B+1){
        blocks[i].clear();
    }

    for(auto [x,i] : st){
        blocks[ind/B].pb({x,i});
        block_num[i] = ind/B;
        ind++;
    }

    rep(b,n/B+1){
        upd_block(b);
    }
}

void init(int n_, int L_, int X[])
{
    n = n_;
    L = L_;
    a = block_num = cams = mx_point = vector<int>(n);
    rep(i,n) a[i] = X[i];
    rep(i,n) st.insert({a[i],i});
    build();
}

int upds = 0;

int update(int i, int v)
{
    upds++;
    if(upds%B == 0){
        build();
    }

    int b = block_num[i];

    {
        auto &curr = blocks[b];
        pii px = {a[i],i};
        curr.erase(find(all(curr),px));
        upd_block(b);
    }

    st.erase({a[i],i});
    a[i] = v;
    st.insert({a[i],i});
    auto it = st.find({a[i],i});

    if(next(it) != st.end()){
        b = block_num[next(it)->ss];
    }
    else if(it != st.begin()){
        b = block_num[prev(it)->ss];
    }
    else{
        b = 0;
    }

    block_num[i] = b;

    {
        auto &curr = blocks[b];
        pii px = {a[i],i};
        curr.insert(upper_bound(all(curr),px),px);
        upd_block(b);
    }

    int mx_reach = -1;
    int ans = 0;

    rep(b,n/B+1){
        auto &curr = blocks[b];
        pii px = {mx_reach+1,-1};
        auto it = upper_bound(all(curr),px);
        if(it == curr.end()){
            conts;
        }

        int j = it->second;
        ans += cams[j];
        mx_reach = mx_point[j];
    }  

    return ans;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6488 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6488 KB Output is correct
4 Correct 2 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6600 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6488 KB Output is correct
4 Correct 2 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6600 KB Output is correct
7 Correct 173 ms 10576 KB Output is correct
8 Correct 196 ms 11156 KB Output is correct
9 Correct 273 ms 13436 KB Output is correct
10 Correct 284 ms 13160 KB Output is correct
11 Correct 259 ms 13412 KB Output is correct
12 Correct 519 ms 13412 KB Output is correct
13 Correct 270 ms 13260 KB Output is correct

Subtask #4
47.0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6488 KB Output is correct
4 Correct 2 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6600 KB Output is correct
7 Correct 173 ms 10576 KB Output is correct
8 Correct 196 ms 11156 KB Output is correct
9 Correct 273 ms 13436 KB Output is correct
10 Correct 284 ms 13160 KB Output is correct
11 Correct 259 ms 13412 KB Output is correct
12 Correct 519 ms 13412 KB Output is correct
13 Correct 270 ms 13260 KB Output is correct
14 Correct 288 ms 11388 KB Output is correct
15 Correct 292 ms 11600 KB Output is correct
16 Correct 846 ms 13668 KB Output is correct
17 Correct 919 ms 15132 KB Output is correct
18 Correct 972 ms 15136 KB Output is correct
19 Correct 398 ms 15364 KB Output is correct
20 Correct 880 ms 15132 KB Output is correct
21 Correct 930 ms 15188 KB Output is correct
22 Correct 444 ms 15104 KB Output is correct

Subtask #5
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6488 KB Output is correct
4 Correct 2 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6600 KB Output is correct
7 Correct 173 ms 10576 KB Output is correct
8 Correct 196 ms 11156 KB Output is correct
9 Correct 273 ms 13436 KB Output is correct
10 Correct 284 ms 13160 KB Output is correct
11 Correct 259 ms 13412 KB Output is correct
12 Correct 519 ms 13412 KB Output is correct
13 Correct 270 ms 13260 KB Output is correct
14 Correct 288 ms 11388 KB Output is correct
15 Correct 292 ms 11600 KB Output is correct
16 Correct 846 ms 13668 KB Output is correct
17 Correct 919 ms 15132 KB Output is correct
18 Correct 972 ms 15136 KB Output is correct
19 Correct 398 ms 15364 KB Output is correct
20 Correct 880 ms 15132 KB Output is correct
21 Correct 930 ms 15188 KB Output is correct
22 Correct 444 ms 15104 KB Output is correct
23 Correct 1910 ms 26460 KB Output is correct
24 Correct 2210 ms 26452 KB Output is correct
25 Correct 1620 ms 26508 KB Output is correct
26 Correct 1719 ms 23656 KB Output is correct
27 Correct 2068 ms 23652 KB Output is correct
28 Correct 845 ms 13236 KB Output is correct
29 Correct 818 ms 13260 KB Output is correct
30 Correct 822 ms 13424 KB Output is correct
31 Correct 825 ms 13256 KB Output is correct
32 Correct 1612 ms 23636 KB Output is correct
33 Correct 1688 ms 23648 KB Output is correct
34 Correct 1757 ms 23652 KB Output is correct
35 Correct 1642 ms 23648 KB Output is correct
36 Correct 1657 ms 23888 KB Output is correct
37 Correct 2920 ms 25056 KB Output is correct
38 Correct 1672 ms 23656 KB Output is correct
39 Correct 1718 ms 23648 KB Output is correct
40 Correct 1828 ms 23648 KB Output is correct
41 Correct 3285 ms 23668 KB Output is correct
42 Correct 3438 ms 23660 KB Output is correct